Off topic, but according to [1], web workers have not been available in Android Browser since 2.1. There's a SO Question [2] about this, which points to [3]. Seems crazy, when Chrome for Mobile does support it [4].
1: http://caniuse.com/webworkers
2: http://stackoverflow.com/questions/7523745/why-was-html5-web...
3: http://code.google.com/p/android/issues/detail?id=10004#c7